More tector lingo - 2-D, Widescan, or DD coil..

[Uncle Willy]

A coplanar or concentric coil consisting of two 'D' shaped transmitter and receive windings laid back to back with the spines of the 'D' overlapping each other two or more inches. These coils produce a signal 2-3 inches wide right down the center of the coil from tip to tip and will detect as deep at either end as they will anywhere else.

Since there is no receive coil for pinpointing one must pinpoint off the center tip of either end of the coil. These coils are designed for penetrating heavy mineralization and maximum ground coverage. They do not discriminate nearly as well as concentrics and love bottlecaps.

Bill

 

[Mick in Dubbo]

Thanks for the info Bill. It's good to increase knowledge.
I have a question for you. How do you mean that DD coils love bottle caps? I seen comments about this before, but don't understand it.
Also, when you are referring to bottle cape, do you mean screw caps or twist tops? The difference is significant.
Thanks.
Mick Evans.

 

[John D.]

Hello,
I'm not Bill, but I bought a DD coil a few months ago and I found out very quickly that it thinks bottle caps are quarters. It give you that pretty money ring and you dig up a Pepsi cap.
I like the DD, however I wish I had spent my money somewhere else.

 

[Uncle Willy]

They like either kind, which means they won't reject them for squat.

Bill

 

[Uncle Willy]

THey're a great coil for what they are designed for but they ain't for general coinshooting, especially in trashy areas.

Bill

 

[WolfdogIa.]

Bill Thanks for what you are doing!!!

 

[draaiorgel]

Great info Bill,
Thanks for sharing. (keep em comin')

 

[Mick in Dubbo]

Here in Oz, my favourite coins are in screw cap range anyway.Looking at the face of the Ace, a quarter is a notch above screw cap, and $1 and $2. Are you saying that when a DD coil loves screw caps; this is what is meant? If it is, then if a DD coil was available for the Ace, then it would be a perfect detector!
At the moment, the only way that I can tell a screw cap from a coin, is if it is real shallow and the screw cap fades off pinpoint. I dig a lot of screw caps. I have played around with a DD coil on another brand of detector and found that the DD coil doesn't give you the target feed back that you can get from a concentric coil, when in pinpoint. I assume that that would be because it has only half the windings of the concentric, hence it being less sensitive.
Mick Evans.

 

[Uncle Willy]

Yeah they don't discriminate nearly as well as a concentric. It has the same windings - a transmit coil and a receive coil - just congfigured differently so that it throws a narrow wedge shaped pattern the full length of the coil into the ground instead of a cone shaped pattern. It has a very large footprint.

Bill

 

[Uncle Willy]

Well I thought it might be of interest to some of you fellers. A little knowledge goes a long ways.

Bill

 

[Uncle Willy]

I will till I run out of breath.

Bill

 

[Mick in Dubbo]

Are you saying that screw caps tend to show up in more notches on a DD coil than a concentric coil?
Mick Evans.